Needle guard for sewing machines



Dec. 24, 1929. M. Gul-u.. 1,740,853

NEEDLE GUARD FOR SEWING IACHINES Filed Jan.9, 1928 @yf EN EENIN Patented Dec. 24, 1929 UNITE STATES MARTIN GUI-IL, OF HAMBURG, GERMANY NEEDLE GUARD FOR SEWING MACHINES Application ied January 9, 1928, Serial No.

The usual needle-guards for sewing-machines consist of a clamping ring having a clamping or set-screw. F or the salie of an easy handling of such a needle-guard the said set-screw must be arranged to be on the right-hand side of the needle-rod. This involves the neces ity of placing the open side of the channel or groove of the needle-rod and that part of the head or shoulder of the needle protruding from the groove of the needle-rod and being acted upon by the needle-guard, on the left-hand side. For needles having a flat-head or shoulder Which, owing to its being situated with relation to the sewing machine, protrudes with such head or shoulder on the right-hand side from the needle-groove in the needle-rod, the said usual needle-guards are inappropriate, for the reason that the set-screw must be situated on the left-hand side of the needle-rod.

On account of its projecting parts the usual needle-guard interferes with the sewing, is unhandsome and unhandy in use, as the screwing home of the set-screw must be eifectod from the left-hand side.

rlhe improved needle-guard forming the subject-mattei' of the present invention, does away with the said drawbacks and renders possible to utilize the advantages of flatheaded or dat-shouldered needles for sewingmachine ystems with which the head or shoulder of the needle protrudes on the righthand side from the groove of the needle-rod. This is obtained by means of a U-shaped member or bail provided in its arcuate or yoke-part with a set-screw and in each of its arms with a circular bore embracing the lower part or stud of the needle-rod. Between the said arms of the bail is placed on the stud of the needle-rod a loosely fitting sleeve adapted to be pressed by the set-screw against the protruding shoulder of the needle and clamp the latter against the bottom-face of the groove of the needle-rod.

In the accompanying sheet of drawings is shown as an example, a preferred form of the improved needle guard constructed in accordance with and embodying the invention.

245,353, and in Germany January 21, 1927.

Similar numerals of reference designate like parts throughout the figures.

Fig. 1 is a front elevation, Fig. 2 a similar view partly in vertical transverse section, F ig. 3 plan view, and F ig. 4 a horizontal cross-sectional view, of the improved needleguard.

The needle-guard comprises a U-shaped holding member 1 provided in its yoke-part with a set-screw 2. Upon the stud 8 of the needle-rod 7 between the arms of the mem` bei' 1' is mounted a pressing and guiding sleeve 3. The bore of the sleeve 3 is of such a size or diameter that the shoulder 4 of the needle 13 may only be inserted into the groove 12 of the needle-rod 7 and its stud 8 respectively when the flat surface 5 of the needleshoulder 4 is snugly contacting the bottomface 6 of the groove 12. The bores 9 of the upper and lower arms of the yoke-member 1 have about the same size as the bore of the sleeve 8. ln order to prevent any slipping of the yolie-memberl and sleeve 3 from the stud 8 of the needle-rod 7, there is provided in the wall of the sleeve 3 a retaining-screw 10, the point 16 of which engages a hole 11 in stud 8 of the needle-rod 7. Oppositely to the screw 10 the sleeve 3 is provided on its outer circumference with a recess 14 adapted to be engaged by the stud 15 of the set-screw 2 whereby displacement in a horizontal plane of the yoke-member 1 on the stud 8 is prevented, thus securing in a reliable manner the proper position of the yoke-member 1 and its set-screw 2 with relation to the sleeve 3 and the groove 12.

In order to firmly clamp the needle 13, 4 to to the needle-rod 7, 8 the former is inserted from below into the groove 12 until the end or top-face of the needle-shoulder 4 strikes against the stop-screw 17, whereupon the setscrew 2 is tightened by turning it in a clockwise direction. By this means the stud 15 of the set-screw is caused to press against the sleeve 3 and to clamp the shoulder 4 against the inner or bottom wall of the groove 12 of the needle rod 7, 8, so that a reliable connection is established between the needle and the needle-rod. The force or strain engendered by the set-s'rew in the yoke-member is received l by its upper and lower arms and imparted by the same to the needle-rod 7 or more properly to the stud 8 of the latter.

I claim:

l. In a needle holding means for sewing machines, a needle rod having a groove in one of its sides, a recessed holding member embracing said rod, a sleeve fitting in the recess of the holding member and embracing the rod and having a wall portion lying opposite the inner wall of the groove in the rod, a needle fitted in the groove of the rod and disposed between the inner wall of the groove and said wall portion of the sleeve, and a set screw on the holding member and engaging the sleeve to clamp the needle between the same and the rod.

2. In a needle holding means for sewing machines, a needle rod having a groove in one Vof its sides, a holding member comprising a pair of spaced, superposed apertured arms Aembracing the rod and a yoke connecting said arms at the side of said member facing the groove in the rod, a sleeve iitting between the arms of the holding member and embracing the rod andhaving a wall portion lying` opposite the inner wall of the groove in the rod, and a set screw carried by the yoke of the holding member and engaging the sleeve to clamp the needle between the said wall portion of the sleeve and the inner wall or' the groove in the rod.

3. In a needle holding means for sewing machines, a needle rod having a groove in one of its sides, a holding member comprising a pair of spaced, superposed apertured arms embracing the rod and a yoke connecting said arms at the side of said member facing the groove in the rod, a sleeve litting between the arms of the holding member and embracing the rod and having a wall portion lying opposite the inner wall of the groove in the rod, means on the sleeve engaging the rod to hold said sleeve from rotation, and a set screw carried by the yoke of the holding member and engaging the sleeve to clamp the needle between the said wall portion of the sleeve and the inner wall of the groove in the rod.

In testimony whereofl I aliiX my signature.

MARTINV GUHL. 

